//working with array //demostrates array usage. // Source: Learn c++ for game development by Bruce Sutherland #include // for cout, endl #include // for array :D #include //for find namespace { const unsigned int ARRAY_SIZE = 5; } using std::cout; using std::endl; using MyArray = std::array; void ArrayIterators(MyArray myArray) { //iterate through array and print each element to its own line for(MyArray::iterator iter = myArray.begin(); iter != myArray.end(); ++iter) { cout << *iter << endl; } cout << endl; //iterate through the array backwards (same problem as string iterator, does not print first element) for(MyArray::iterator iter = myArray.end() - 1; iter != myArray.begin(); --iter) { cout << *iter << endl; } cout << endl; //using reverse_iterator to iterate through array backwards (works for all elements) for(MyArray::reverse_iterator iter = myArray.rbegin(); iter != myArray.rend(); ++iter) { cout << *iter << endl; } cout << endl; //const iterator for(MyArray::const_iterator iter = myArray.cbegin(); iter != myArray.cend(); ++iter) { cout << *iter << endl; } cout << endl; //const reverse iterator for(MyArray::const_reverse_iterator iter = myArray.crbegin(); iter != myArray.crend(); ++iter) { cout << *iter << endl; } cout << endl; //auto iterator for(auto iter = myArray.begin(); iter != myArray.end(); ++iter) { cout << *iter << endl; } cout << endl; //auto iterator - const for(auto iter = myArray.cbegin(); iter != myArray.cend(); ++iter) { cout << *iter << endl; } cout << endl; //editing array contents via iterator for(MyArray::iterator iter = myArray.begin(); iter != myArray.end(); ++iter) { *iter = 5; cout << *iter << endl; } cout << endl; for(MyArray::const_iterator iter = myArray.cbegin(); iter != myArray.cend(); ++iter) { // *iter = 5; //error - iterator is constant. Can not change contents! cout << *iter << endl; } } void FindInArray(MyArray myArray) { //insert search functions here. //find using for loop for(unsigned int i = 0; i < ARRAY_SIZE; ++i ) { if(myArray[i] == 2) { cout << "Found " << myArray[i] << " at position: " << i << endl; } } //find using auto iterator for(auto iter = myArray.begin(); iter != myArray.end();++iter) { if(*iter == 2) { cout << "Found: " << *iter << endl; } } //Using for range to search array <- https://msdn.microsoft.com/en-us/library/jj203382.aspx for(auto& number : myArray) { if(number == 2) { cout << "Found: " << number << endl; } } //using find to search array MyArray::iterator found = std::find(myArray.begin(), myArray.end(), 2); if(found != myArray.end()) { cout << "Found: " << *found << endl; } } int main() { //int oldStyleArray[ARRAY_SIZE] = { 0, 1 ,2 ,3, 4}; std::array newStyleArray = { 0, 1 ,2 ,3, 4}; ArrayIterators(newStyleArray); FindInArray(newStyleArray); return 0; }

Working with Array